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  The Original Code is "The Columba Project"

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Preprocessing filters modifying the message contents before the message
gets displayed in the message viewer.
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In Columba we never change the message contents, is always saved in the mailbox
as it is. But decryption of messages makes it necessary to modify the original 
message. Therefore a temporary folder is used where the modified message is
saved. All references are re-mapped to this temporary folder. This makes it
possible to execute all actions on this message as if it would be the original.


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